unichip is not just as simple as it seen, both have it’s advantage . Fully mechanical is known to be as simple as possible. Electronic controlled does have the benefits like precise tuning . The resistor modification doesn’t increase any performance because the working value is not precise...
unichip is a very good ecu addup for the 1KZ-TE . changing the resistor value does not improve any performance at all .
i can say like unichip with 5mode selector is the best you can turn to aggresive mode instantly by just turning the knob.
you would also need a tuner for tuning the things...